Eskay wrote:
On 21 Jan 2005 05:33:37 -0800, wrote:
I am experimenting making a j pole out of 1/2 inch conduit. What I
am
thinking of doing is making it like a "u" in that each piece, the
radiator, stub and shorting bar are cut at 45 degree angles and
welded
togther. I have the dimensions using the 1/2 inch copper. How do i
measure each pieces "length"? I mean in the copper plan they use t
fittings and measure the radiator length starting incide the t
fitting
where it is lower than the shorting bar.
My ides was to just measure the end of the angled piece where I cut
it
to the top, but not sure if this is right. What do you think?
Also, since an antenna constructed this way will not have an
"extended
leg" to mount to a mast, would it be acceptable to mount the
shorted
horizontal section to the mast? Will this cause problems?
Any help is appreciated. I hope to work on this tomorrow.
I am assuming that you are talking about using EMT conduit.
It will rust pretty quickly and the welds will rust even sooner.
Why not use 1/2 inch copper plumping pipe?
73 de Eskay
Yes EMT conduit. I will paint it to keep it from rusting.
I have emt at my house and I can weld it. I dont have enough copper and
I have never soldered copper plus I would have to buy a bunch of
fittings.